Optical member, backlight assembly and liquid crystal display device using the same

ABSTRACT

Disclosed are an optical member ( 100 ), a backlight assembly ( 500 ) and a liquid crystal display device ( 800 ) using the optical member. The optical member ( 100 ) includes an optical body ( 110 ) and a first fixing part ( 120 ). The optical body varies optical characteristic of first light incident into thereto to exit a second light. The first fixing part ( 120 ) is protruded from at least one side face of the optical body ( 110 ), and including a fixing hole ( 122 ) and a vibration attenuating means ( 124 ). The fixing hole ( 122 ) is elongated in a main expansion direction of the optical body ( 110 ), and the vibration attenuating means ( 124 ) is formed on an inner of the fixing hole to attenuate external vibration applied to the optical body ( 110 ). The fixing hole ( 122 ) allows movement of the optical member ( 100 ) in accordance with expansion of the optical member ( 100 ) caused by heat, thereby preventing wrinkles from being created on the optical body. The vibration attenuating member ( 124 ) prevents the optical body from being scratched.

TECHNICAL FIELD

The disclosure relates to an optical member, a backlight assembly and aliquid crystal display (LCD) device using the same, and moreparticularly to an optical member, a backlight assembly and a liquidcrystal display device using the same, the optical member capable ofpreventing scratches from being created on the optical member due toexternal vibration without using an adhesive member, and allowing anmovement of the optical member in accordance with expansion andcontraction of the optical member caused by heat.

BACKGROUND ART

A liquid crystal display device is an appliance for displaying images byusing liquid crystal.

In order to display images, a conventional liquid crystal display deviceincludes a light supplying part for generating light required fordisplaying images, an optical part for making brightness distribution ofthe light to be uniform, and a liquid crystal control part forcontrolling the liquid crystal.

For example, the light supplying part of the liquid crystal displaydevice includes a cold cathode fluorescent lamp (CCFL) that generateswhite light and has a relatively low heat-producing rate with long lifespan.

The optical part uniformly distributes the brightness of the lightgenerated from the CCFL. Although there is a small difference accordingto kinds of the liquid crystal display devices to be used, the opticalpart basically includes an optical sheet.

The optical sheet includes a diffusion sheet for uniformly distributingthe brightness of the light generated from the CCFL by diffusing thelight generated from the CCFL, and a prism sheet for collecting a lightexiting from the diffusion sheet.

The optical part may have a light guiding plate. The light guiding platechanges the light generated from the CCFL into a light having an opticaldistribution of a surface light source.

The liquid crystal control part controls the liquid crystal in a pixelunit, such that transmissivity of light processed by the optical partcan be controlled in a pixel unit. Thus, images are displayed by theliquid crystal control part.

Among the light supplying part, especially the optical part affects agreat influence on display quality of the liquid crystal display device.

The above-mentioned diffusion sheet or prism sheet of the optical partis fixed by using a double-faced adhesive tape, or fixed to a boss byforming a hole at an extension part of the diffusion sheet or the prismsheet.

However, since the optical part is manufactured to have a thin sheetshape by using synthetic resin, the optical part easily expands by heat.

When the optical part expands in a state that the optical sheet issecurely fixed by the double-faced adhesive tape, wrinkles are createdon the optical part, so that display quality is deteriorated. In otherwords, the wrinkles created on the optical part cause stains to be shownwhen images are displayed.

In order to solve the above problem, there is an attempt to movably fixthe optical part.

However, when the optical part is movably fixed, the optical part makesa friction with respect to the liquid crystal control part that isadjacent to the optical part due to external vibration applied to theoptical part.

When friction occurs between the optical part and the liquid crystalcontrol part, scratches are created on the liquid crystal control partor the optical part, thereby deteriorating display quality.

DISCLOSURE OF THE INVENTION

The present invention has been made to solve the above problems of priorarts, therefore, it is a first object of the present invention toprovide an optical member capable of preventing scratches from beingcreated on the optical member due to expansion of the optical membercaused by heat and due to external vibration applied the optical member,without using an adhesive member.

A second object of the present invention is to provide a backlightassembly capable of displaying superior quality of images by preventingan optical member from being scratched due to expansion of the opticalmember caused by heat and due to external vibration applied the opticalmember, without using an adhesive member.

A third object of the present invention is to provide a liquid crystaldisplay device capable of displaying superior quality of images bypreventing an optical member from being scratched due to expansion ofthe optical member caused by heat and due to external vibration appliedthe optical member, without using an adhesive member.

To achieve the first object of the present invention, there is providedan optical member of a liquid crystal display device, the optical membercomprising: an optical body for varying an optical characteristic of afirst light incident into the optical body to exit a second light; and afirst fixing part protruded from at least one side face of the opticalbody, the first fixing part including a fixing hole and a vibrationattenuating means, the fixing hole allowing an movement of the opticalbody in accordance with an expansion and a contraction of the opticalbody, and the vibration attenuating means formed on an inner surface ofthe fixing hole to attenuate an external vibration applied to theoptical body.

To achieve the second object of the present invention, there is provideda backlight assembly comprising: a receiving container including i) abottom face, ii) sidewalls protruded from edges of the bottom face toprovide a receiving space, iii) a recess respectively formed on an upperportion of two opposite sidewalls of the receiving container, and iv) afixing boss formed on a bottom surface of the recess and projected inparallel to the sidewalls; a lamp, received in the receiving container,for generating a first light; a first optical member, coupled to thelamp, for varying an optical characteristic of the first light to exit asecond light; and a second optical member including i) an optical bodyfor varying the optical characteristic of the second light incident intothe optical body to exit a third light, and ii) a first fixing partprotruded from at least one side face of the optical body, the firstfixing part including a fixing hole and a first vibration attenuatingmeans, and the vibration attenuating means formed on a first innersurface of the fixing hole and the first fixing part to attenuate anexternal vibration applied to the optical body.

To achieve the third object of the present invention, there is provideda liquid crystal display device comprising: a receiving containerincluding i) a bottom face, ii) sidewalls protruded from edges of thebottom face to provide a receiving space, iii) a recess respectivelyformed on an upper portion of two opposite sidewalls of the receivingcontainer, and iv) a fixing boss formed on a bottom surface of therecess and projected in parallel to the sidewalls; an optical moduleincluding a lamp and a first optical member, the lamp received in thereceiving container to generate a first light, and the first opticalmember varying an optical characteristic of the first light to exit asecond light; a second optical member including i) an optical body forvarying the optical characteristic of the second light incident into theoptical body to exit a third light, and ii) a first fixing partprotruded from at least one side face of the optical body, the firstfixing part including a fixing hole and a first vibration attenuatingmeans, the fixing hole being elongated in a main expansion direction ofthe optical body to receive the fixing boss, and the vibrationattenuating means being formed on an inner surface of the fixing hole toattenuate an external vibration applied to the optical body; a liquidcrystal display panel assembly, disposed on the second optical member tobe received in the receiving container, for changing the third lightinto a fourth light having image information; and a chassis, coupled tothe receiving container on which the liquid crystal display panelassembly is received, for preventing the liquid crystal display panelassembly from being separated from the receiving container.

According to the present invention, the liquid crystal display devicecan display superior quality of images by absorbing external vibrationapplied thereto and simultaneously by allowing expansion of an opticalmember caused by heat generated from a lamp without deterioratingdisplay quality.

BRIEF DESCRIPTION OF THE DRAWINGS

The above objects and other advantages of the present invention willbecome more apparent by describing in detail preferred embodimentsthereof with reference to the attached drawings in which:

FIG. 1 is a side view showing an optical member according to a firstexemplary embodiment of the present invention;

FIG. 2 is a plan view showing one of an optical member according to afirst exemplary embodiment of the present invention;

FIG. 3 is an enlarged view of “A” shown in FIG. 2;

FIG. 4 is a plan view showing an optical member according to a secondexemplary embodiment of the present invention;

FIG. 5 is an enlarged view of “B” shown in FIG. 4;

FIG. 6 is an enlarged view of “C” shown in FIG. 4;

FIG. 7 is a plan view showing an optical member according to a thirdexemplary embodiment of the present invention;

FIG. 8 is a schematic view showing a backlight assembly according to thepresent invention;

FIG. 9 is a partial sectional perspective view showing a part of asidewall of a receiving container according to the present invention;

FIG. 10 is a plan view showing a first fixing part coupled to a fixingboss according to the present invention;

FIG. 11 is a plan view showing a second fixing part coupled to a fixingboss according to one exemplary embodiment of the present invention;

FIG. 12 is a plan view showing a first fixing part coupled to a fixingboss according to another exemplary embodiment of the present invention;

FIG. 13 is a perspective view showing a liquid crystal display deviceaccording to the present invention;

FIG. 14 is a sectional view showing a liquid crystal display panel ofFIG. 13; and

FIG. 15 is an equivalent circuit diagram of a TFT shown in FIG. 14.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail withreference to accompanying drawings. The same reference numerals are usedto refer the same elements.

Embodiment 1

FIG. 1 is a side view showing an optical member 100 according to a firstexemplary embodiment of the present invention.

Referring to FIG. 1, the optical member 100 varies opticalcharacteristics of a first light 175 generated in a first region 170 toexit a second light 177 towards a second region 180.

The optical characteristics include, for example, brightness uniformityof light, orientation of light, and light usage efficiency.

When the optical member 100 satisfies the above optical characteristics,only one sheet of optical member 100 may be used. However, since it isdifficult to satisfy the brightness uniformity of light, the orientationof light, and the light usage efficiency by means of only one sheet ofoptical member, three sheets of optical members 100 are typicallyemployed.

The optical member 100 includes a diffusion sheet that exits a secondlight 177 by enhancing brightness uniformity of the first light 175.

The diffusion sheet diffuses the first light 175 in order to exit thesecond light 177 having uniform brightness over the entire area of theoptical member 100.

In addition, the optical member 100 further includes a prism sheet thatexits a second light 177 by enhancing a viewing angle of the first light175.

The prism sheet varies a direction of the first light 175 so that thedirection of the first light 175 may be substantially vertical to anupper surface of the optical member 100, thereby exiting a second light177 having an broaden viewing angle.

The optical member 100 further includes a dual brightness enhanced film(DBEF) for improving the usage efficiency of the first light 175. TheDBEF reproduces the first light 175 to exit a second light 177 withmaximized light usage efficiency and enhanced brightness uniformity.

FIG. 2 is a plan view showing one of the optical members according tothe first exemplary embodiment of the present invention.

Referring to FIG. 2, each optical member 100 having various opticalcharacteristics commonly has a thin plate shape or a sheet shape.

The optical member 100 includes an optical body 110 and a first fixingpart 120.

The optical body 110 enhances the brightness uniformity, orientation orusage efficiency of the first light 175.

Preferably, the optical body 110 has a rectangular parallelepiped shape.Thus, the optical body 110 has four side faces. Reference numerals 111,112, 113 and 114 represent the four side faces, respectively.

The first fixing part 120 is provided to fix the optical body 110 havingthe above shape.

The first fixing part 120 may be formed on the optical body 110 withoutchanging the shape of the optical body 110. However, it is not desirousto form the first fixing part 120 on the optical body 110 withoutchanging the shape of the optical body 110, because optical functions ofthe optical body 110 may be weakened.

For this reason, as shown in FIG. 2, the fixing part 120 is protrudedfrom the side faces of the optical body 110. Preferably, a pair of firstfixing parts 120 are protruded from two opposite side faces 112 and 114,respectively. The fixing parts 120 formed on a side face of the opticalbody 110 are spaced from each other.

The fixing part 120 not only fixes the optical body 110, but alsoprevents display quality from being lowered even if the optical body 110is expanded due to heat or external vibration is applied to the opticalbody 110.

FIG. 3 is an enlarged view of “A” shown in FIG. 2.

Referring to FIG. 3, the first fixing part 120 has a fixing hole 122 andvibration attenuating protrusions 124.

The fixing hole 122 prevents wrinkles from being created on the opticalbody 110 when the optical body 110 is expanded due to heat, and allowsthe optical body 110 to be fixed to a predetermined position.

For example, the fixing hole 122 has a shape of an elongated hole havinga long axis in a predetermined direction so as to prevent wrinkles frombeing created on the optical body 110. In this case, a major axisdirection (‘X’) of the elongated fixing hole 122 is very important. Themajor axis direction (‘x’) of the elongated fixing hole 122 matches witha main expanding direction of the optical body 110.

While optical body 110 is movable due to the fixing hole 122 in the mainexpanding direction of the optical body 110, the vibration attenuatingprotrusion 124 attenuates the external vibration applied to the opticalbody 110. At least one vibration attenuating protrusion 124 is protrudedfrom an inner surface of the fixing hole 122 toward a center of thefixing hole 122.

The vibration attenuating protrusion 124 makes contact with an element(not shown) inserted into the fixing hole 122 to absorb externalvibration applied to the optical body 110.

It is preferred to provide many vibration attenuating protrusions 124having a small size at the inner surface of the fixing hole 122 and thefixing part 120. The vibration attenuating protrusions 124 may bearranged exactly opposite to each other or athwart opposite each otherwith respect to the major axis of the fixing hole 122.

Embodiment 2

FIG. 4 is a plan view showing an optical member 100 according to asecond exemplary embodiment of the present invention.

Referring to FIG. 4, the optical member 100 includes an optical body 110and a first fixing part 130.

The optical body 110 has a rectangular parallelepiped sheet shape or arectangular parallelepiped plate shape. Thus, the optical body 110 hasfour side faces 111, 112, 113 and 114.

At least one fixing part 130 is protruded from two opposite side faces112 and 114, respectively.

Preferably, a pair of first fixing parts 120 are protruded from twoopposite side faces 112 and 114, respectively. The fixing parts 120formed on a side face of the optical body 110 are spaced from eachother. The fixing parts 120 are protruded in parallel to an upper (orlower) surface of the optical body 130.

FIG. 5 is an enlarged view of “B” shown in FIG. 4.

Referring to FIG. 5, the first fixing part 130 has a fixing hole 132 anda vibration attenuating protrusion 134 identical to the fixing hole 122and the vibration attenuating protrusion 124 described in the firstexemplary embodiment. In addition, at least one first through-hole 136is formed adjacent to the fixing hole 132. Specifically, at least onethrough-hole is formed on a portion of the first fixing part 130. Theportion is disposed on a circumference of the fixing hole 132, is apredetermined distance apart from the fixing hole 132. For example, fivefirst through-holes 136 are formed on the portion of the first fixingpart 130. The first through-holes 136 are arranged at one side or bothsides of the fixing hole 132 in a row.

FIG. 6 is an enlarged view of “C” shown in FIG. 4.

Referring to FIG. 6, a second through-hole 138 may be respectivelyformed on a first portion and a second portion of the first fixing part130. The second through-holes 138 formed on the first and secondportions are disposed to face each other. A major axis of each of thesecond through-holes 138 is parallel to the major axis of the fixingholes 132.

A shape of the first and second through-holes 136 and 138 is not limitedto above shape, and the first and second through-holes 136 and 138 maybe formed in various shapes so as to allow an element (not shown) to beeasily inserted into the fixing hole 132.

Embodiment 3

FIG. 7 is a plan view showing an optical member according to a thirdexemplary embodiment of the present invention.

Referring to FIG. 7, the optical member 100 includes an optical body110, a first fixing part 140 and a second fixing part 150.

The optical body 110 has a rectangular parallelepiped sheet shape or arectangular parallelepiped plate shape. Thus, the optical body 110 hasfour side faces 111, 112, 113 and 114.

The first fixing part 140 is protruded from one side face 114.Preferably, at least one first fixing part 140 or a pair of first fixingparts 140, which are spaced by a predetermined distance from each other,are protruded from the side face 114, respectively.

The first fixing part 140 has a fixing hole 142 and vibrationattenuating protrusions 144 identical to the fixing hole 132 and thevibration attenuating protrusions 134 described in the second exemplaryembodiment. Thus, the shapes of the fixing hole 142 and the vibrationattenuating protrusions 144 will not be further described below to avoida redundancy.

In addition, at least one first through-hole 146 is formed adjacent tothe fixing hole 142. In detail, a pair of first through-holes 146 isformed on the first fixing part 140 opposite to each other about thefixing hole 142.

The second fixing part 150 is formed on the side face 112 of the opticalbody 110. That is, the second fixing part 150 is opposite to the firstfixing part 140.

Preferably, a pair of second fixing parts 150, which are separated fromeach other by a predetermined distance, are protruded from the side face112, respectively.

A cylindrical hole 152 and fixing protrusions 154 are formed in thesecond fixing part 150. At least two fixing protrusions 154 areprotruded from an inner surface of the cylindrical hole 152 toward acenter of the cylindrical hole 152.

Preferably, four fixing protrusions 154, which are separated from eachother at an angle of 90° with respect to a center of the cylindricalhole 152, are formed on the inner surface of the cylindrical hole 152.The fixing protrusions 154 not only fix the optical body 110 in apredetermined position even if the optical body 110 expands due to heat,etc., but also absorb external vibration applied to the optical body110.

When heat is applied to the optical member 100 having the optical body110, the first fixing part 140 and the second fixing part 150, theoptical body 110 begins to expand.

Since the second fixing part 150 protruded from the optical body 110 isfixed to an element (not shown) inserted into the cylindrical hole 152when the optical body 110 expands, movement of the optical body 110 inaccordance with an expansion and a contraction of the optical body isallowed at the first fixing part 140.

In addition, when the second fixing part 150 is fixed to the element(not shown) inserted into the cylindrical hole 152, external vibrationis indirectly transferred to the optical body 110 through the first andsecond fixing parts 140 and 150. The vibration attenuating protrusion144 formed in the first fixing part 140 absorbs most of the externalvibration so that the optical body 110 can be prevented from beingdamaged.

Hereinafter, a backlight assembly using the optical member described inthe first, second and third exemplary embodiments of the presentinvention will be described.

FIG. 8 is a schematic view showing a backlight assembly 500 according tothe present invention.

Referring to FIG. 8, the backlight assembly 500 mainly includes areceiving container 200, a lamp assembly 350, a first optical member360, and a second optical member 100.

The receiving container 200 has a bottom face 210 and sidewalls 220.

The bottom face 210 has a rectangular shape and has four side edges.

The sidewalls 220 extend from the side edges of the bottom face 210 toform a receiving space. The sidewall 220 includes a first, second, thirdand fourth sidewalls 221, 223, 225, and 227.

FIG. 9 is a partial sectional perspective view showing a part of asidewall of a receiving container according to the present invention.

Referring to FIG. 9, recesses 223 a and 227 a are respectively formed infirst and third sidewalls 223 and 227, which are opposite to each other.The recesses 223 a and 227 a are provided with fixing bosses 223 b and227 b, respectively.

The recesses 223 a and 227 a are formed at inner upper portions of thefirst and third sidewalls 223 and 227. Preferably, a pair of recesses223 a are formed in the first sidewall 223 with a predeterminedinterval, and a pair of recesses 227 a are formed in the third sidewall227 with a predetermined interval.

At least one fixing boss is formed at bottom of the recesses 223 a, 227a. According to the present invention, fixing bosses 223 b, 227 b areformed in the bottom of the recesses 223 a, 227 a, respectively.

Tips of the fixing bosses 223 b and 227 b are preferably rounded orchamfered in order to allow the optical member 110 to be easily coupledto the second optical member 100.

As shown in FIG. 8, the lamp assembly 350 includes a lamp 310, a lampholder (not shown) and a lamp cover 320.

The lamp 310 is preferably manufactured in a small size with long lifespan, while reducing heat-producing rate when generating light. For thisreason, a cold cathode fluorescent lamp (CCFL) may be used.

The lamp cover 320 covers the lamp 310. The lamp cover 320 guides thelight radiated from the lamp 310 to exit the light in substantially onedirection.

To this purpose, the lamp cover 320 is manufactured by bending a platemade of material having superior reflectivity so as to surround a partof the lamp 310.

A pair of lamp holders are installed at both ends of the lamp 310covered by the lamp cover 320.

The first optical member 360 varies the direction and opticaldistribution of the light generated from the lamp assembly 350.

To this end, according to the preferred embodiment of the presentinvention, the first optical member 360 has a rectangular parallelepipedshape that has four side faces, a light-reflecting surface, and alight-exiting surface.

The two opposite sidewalls of the optical module 400 are inserted intoabove-mentioned lamp covers 320 of the lamp assembly 350.

A light that is radiated from the lamp assembly 310 to have an opticaldistribution of a linear light source is reflected from thelight-reflecting surface of the first optical member 360 to be changedinto a light having an optical distribution of a surface light source.In addition, the first optical member 360 changes a proceeding directionof light. Specifically, the first optical member 360 receives a lightradiated from the lamp assembly 310, guides a light reflected from thelight-reflecting surface thereof to be exited at the light-exitingsurface.

The second optical member 100 is installed on an upper surface of thefirst optical member 360. The second optical member 100 includes atleast one sheet. The second optical member 100 includes a diffusionsheet for uniformly distributing brightness of the light radiated fromthe light-exiting surface of the second optical member 360, a prismsheet for enhancing a viewing angle of light, and a dual brightnessenhanced film (DBEF).

The second optical member 100 having the above-structure may have theoptical body 110 and fixing parts (140, 150).

The optical body 110 has rectangular parallelepiped shape to be easilyaccommodated in the receiving space of the receiving container 200.Thus, the optical body 110 has four side faces.

The fixing parts include the first fixing part 140 and the second fixingpart 150.

The first fixing part 140 is formed at one side face 114 of the opticalbody 110. Preferably, pair of first fixing parts 140, which areseparated from each other by a predetermined interval, are formed on theside face 114 of the optical body 110.

The second fixing part 150 is formed at the side face 112, which isopposite to the first fixing part 140, of the optical body 110.Preferably, a pair of second fixing parts 150, which are separated fromeach other by a predetermined interval, are formed at the side face 112of the optical body 110.

FIG. 10 is a plan view showing a first fixing part coupled to a fixingboss according to the present invention.

Referring to FIG. 10, the first fixing part 140 includes the fixing hole142, the vibration attenuating protrusion 144 and the through-hole 146.

The fixing hole 142 extends in a main expanding direction of the opticalbody 110.

The vibration attenuating protrusion 144 is protruded from an innersurface of the fixing hole 142 toward a center of the fixing hole 142.

The above-mentioned fixing boss 227 b is inserted into the fixing hole142, and the fixing boss 227 b makes contact with an outer surface ofthe vibration attenuating protrusion 144.

FIG. 11 is a plan view showing a second fixing part coupled to a fixingboss according to one exemplary embodiment of the present invention.

Referring to FIG. 11, the second fixing part 150 includes thecylindrical hole 152 and fixing protrusions 154. The cylindrical hole152 has a diameter larger than an outer diameter of the fixing boss 223b.

At least two fixing protrusions 154 are protruded from an inner surfaceof the cylindrical hole 152 toward a center of the cylindrical hole 152so as to maintain the fixing boss 223 b substantially immovable withinthe cylindrical hole 152.

The fixing protrusions 154 allow the fixing boss 223 b to be tightlyfixed in the cylindrical hole 152.

FIG. 12 is a plan view showing a first fixing part coupled to a fixingboss according to another exemplary embodiment of the present invention.

Referring to FIG. 12, similar to the fourth embodiment of the presentinvention, the first fixing part 140 includes the fixing hole 142, thevibration attenuating protrusion 144 and the through-hole 146.

The fixing boss 227 c inserted into the fixing hole 142 has a pluralityof protrusions 227 d, which are formed at an outer surface of the fixingboss 227 c. The protrusions 227 d are engaged with the vibrationattenuating protrusions 144, so that the vibration attenuatingprotrusions 144 can effectively attenuate external vibration.

FIG. 13 is a perspective view showing a liquid crystal display deviceaccording to the present invention.

The optical members and the backlight assembly described in the first,second and third embodiments will not be further described below toavoid a redundancy. Referring now in specific detail to the drawings inwhich like reference numerals identify identical elements throughout theseveral views.

Referring to FIG. 13, the liquid crystal display device 800 mainlyincludes a backlight assembly 500, a liquid crystal display panelassembly 600 and a chassis 700.

The liquid crystal display panel assembly 600 is disposed on an uppersurface of the second optical member 100, which is a part of thebacklight assembly 500. The liquid crystal display panel assembly 600 isfixedly received in the receiving container 200.

The liquid crystal display panel assembly 600 includes a liquid crystaldisplay panel 610 and driving modules 620 and 630.

The liquid crystal display panel 610 controls the quantity of the lightthat passes through the second optical member 100, such that thecontrolled light passes through color filters to display requiredimages.

FIG. 14 is a sectional view showing a liquid crystal display panel ofFIG. 13, and FIG. 15 is an equivalent circuit diagram of a TFT shown inFIG. 14.

Referring to FIGS. 14 and 15, the liquid crystal display panel 610includes the TFT substrate 604, liquid crystal 609 and a color filtersubstrate 605.

The TFT substrate 604 has an insulating substrate 601, thin filmtransistors 602, and pixel electrodes 603.

The thin film transistors 602 are arranged in a matrix shape on theinsulating substrate 601 through a thin film manufacturing process.

In detail, the thin film transistor 602 includes a gate electrode G, aninsulation layer I, a channel layer C, a source electrode S and a drainelectrode D.

The pixel electrode 603 is electrically connected to the drain electrodeD of the thin film transistor 602.

The pixel electrode 603 is comprised of transparent conductive materialsuch as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO).

In order to individually drive the thin film transistor 602 having theabove-structure, the gate electrodes G belonging to a same row in thematrix type thin film transistors 602 are connected to one gate line 602a.

In addition, the source electrodes S belonging to a same column in thematrix type thin film transistors 602 are connected to one data line 602b.

Referring to FIG. 14, the color filter substrate 605 has a glasssubstrate 606, color filters 607 and a common electrode 608.

The color filters 607 are arranged in the insulating substrate 606 in amatrix shape in such a manner that each of the color filters 607 facesthe corresponding pixel electrode 603. The color filters 607 aremanufactured by mixing dye with photosensitive material. The colorfilters 607 includes a red color filter for selectively outputting lighthaving a red wavelength, a green color filter for selectively outputtinglight having a green wavelength, and a blue color filter for selectivelyoutputting light having a blue wavelength. For example, only one of thecolor filters is shown in FIG. 14.

The common electrode 608 is formed over the entire area of theinsulating substrate 606 so as to cover the color filter 607, therebyallowing an electric field required for aligning the liquid crystal tobe applied to the liquid crystal when power signal is applied to thepixel electrode 603.

The liquid crystal 609 is filled between the TFT substrate 604 and thecolor filter substrate 605, and then the liquid crystal 609 is sealed.

The driving modules 620 and 630 shown in FIG. 13 include a printedcircuit board 620 having driver circuits for driving the liquid crystaldisplay panel 610, and a tape carrier package 630 for connecting theprinted circuit board 620 to the liquid crystal display panel 610.

The chassis 700 prevents the liquid crystal display panel assembly 600from being separated from the receiving container 200, and protects theliquid crystal display panel assembly 600 from external impact.

While the present invention has been described in detail with referenceto the preferred embodiments thereof, it should be understood to thoseskilled in the art that various changes, substitutions and alterationscan be made hereto without departing from the scope of the invention asdefined by the appended claims.

1. An optical member of a liquid crystal display device, the opticalmember comprising: an optical body for varying an optical characteristicof a first light incident into the optical body to exit a second light;and a first fixing part protruded from at least one side face of theoptical body, the first fixing part including a fixing hole and avibration attenuating means, the fixing hole allowing a movement of theoptical body in accordance with an expansion and a contraction of theoptical body, and the vibration attenuating means formed on an innersurface of the fixing hole to attenuate an external vibration applied tothe optical body.
 2. The optical member as claimed in claim 1, whereinthe first fixing part is formed on two side faces of the optical body,and the two side faces are opposite to each other.
 3. The optical memberas claimed in claim 1, wherein the vibration attenuating means includesat least one vibration attenuating protrusion, and the at least onevibration attenuating protrusion is protruded from the inner surface ofthe fixing hole toward a center of the fixing hole.
 4. The opticalmember as claimed in claim 3, wherein at least one through-hole isformed on a portion of the first fixing part, and the portion isdisposed near the fixing hole.
 5. The optical member as claimed in claim3, wherein at least one through-hole is formed on a portion of the firstfixing part, and the portion is spaced apart from the fixing hole by apredetermined distance.
 6. The optical member as claimed in claim 1,wherein the first fixing part is formed on a first side face of theoptical body and a second fixing part is formed on a second side face ofthe optical body, and the second side face is opposite to the first sideface.
 7. The optical member as claimed in claim 6, wherein the secondfixing part includes a cylindrical hole, and at least two fixingprotrusions are protruded from an inner surface of the cylindrical holetoward a center of the cylindrical hole.
 8. The optical member asclaimed in claim 7, wherein the fixing hole is an elongated hole havinga long axis in a main expansion direction of the optical body.
 9. Abacklight assembly comprising: a receiving container including i) abottom face, ii) sidewalls protruded from edges of the bottom face toprovide a receiving space, iii) a recess respectively formed on an upperportion of two opposite sidewalls of the receiving container, and iv) afixing boss formed on a bottom surface of the recess and projected inparallel to the sidewalls; a lamp, received in the receiving container,for generating a first light; a first optical member, coupled to thelamp, for varying an optical characteristic of the first light to exit asecond light; and a second optical member including i) an optical bodyfor varying the optical characteristic of the second light incident intothe optical body to exit a third light, and ii) a first fixing partprotruded from at least one side face of the optical body, the firstfixing part including a fixing hole and a first vibration attenuatingmeans, and the vibration attenuating means formed on a first innersurface of the fixing hole and the first fixing part to attenuate anexternal vibration applied to the optical body.
 10. The backlightassembly as claimed in claim 9, wherein the first vibration attenuatingmeans includes at least one vibration attenuating protrusion, and the atleast one vibration attenuating protrusion is protruded from the innersurface of the fixing hole toward a center of the fixing hole to contactwith a portion of an outer surface of the fixing boss.
 11. The backlightassembly as claimed in claim 10, wherein a second vibration attenuatingmeans is formed on the outer surface of the fixing member to contactwith the vibration attenuating protrusion.
 12. The backlight assembly asclaimed in claim 11, wherein the second vibration attenuating meansincludes at least one protrusion, the at least one protrusion is formedon the outer surface of the fixing boss to attenuate a vibration. 13.The backlight assembly as claimed in claim 9, wherein the first fixingpart is formed on a first side face of the optical body and a secondfixing part is formed on a second side face of the optical body, and thesecond side face is opposite to the first side face.
 14. The backlightassembly as claimed in claim 13, wherein the second fixing part includesa cylindrical hole, and at least two fixing protrusions are protrudedfrom an inner surface of the cylindrical hole toward a center of thecylindrical hole.
 15. The backlight assembly as claimed in claim 9,wherein a tip of the fixing boss has a tapered shape.
 16. The backlightassembly as claimed in claim 9, wherein at least one through-hole isformed on portions of the first fixing part, and each of the portions isadjacent to the first vibration attenuating means.
 17. A liquid crystaldisplay device comprising: a receiving container including i) a bottomface, ii) sidewalls protruded from edges of the bottom face to provide areceiving space, iii) a recess respectively formed on an upper portionof two opposite sidewalls of the receiving container, and iv) a fixingboss formed on a bottom surface of the recess and projected in parallelto the sidewalls; an optical module including a lamp and a first opticalmember, the lamp received in the receiving container to generate a firstlight, and the first optical member varying an optical characteristic ofthe first light to exit a second light; a second optical memberincluding i) an optical body for varying the optical characteristic ofthe second light incident into the optical body to exit a third light,and ii) a first fixing part protruded from at least one side face of theoptical body, the first fixing part including a fixing hole and a firstvibration attenuating means, the fixing hole being elongated in a mainexpansion direction of the optical body to receive the fixing boss, andthe vibration attenuating means being formed on an inner surface of thefixing hole to attenuate an external vibration applied to the opticalbody; a liquid crystal display panel assembly, disposed on the secondoptical member to be received in the receiving container, for changingthe third light into a fourth light having image information; and achassis, coupled to the receiving container on which the liquid crystaldisplay panel assembly is received, for preventing the liquid crystaldisplay panel assembly from being separated from the receivingcontainer.
 18. The liquid crystal display device as claimed in claim 17,wherein the first vibration attenuating means includes at least onevibration attenuating protrusion, and the at least one vibrationattenuating protrusion is protruded from the inner surface of the fixinghole to contact with an outer surface of the fixing boss.
 19. The liquidcrystal display device as claimed in claim 17, wherein the first fixingpart is formed on a first side face of the optical body and a secondfixing part is formed on a second side face of the optical body, and thesecond side face is opposite to the first side face.
 20. The liquidcrystal display device as claimed in claim 19, wherein the second fixingpart includes a cylindrical hole, and at least two fixing protrusionsare protruded from an inner surface of the cylindrical hole toward acenter of the cylindrical hole.